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APPENDIX 



To the " Genera of North American Birds, and Synopsis 

 of the Species found in the United States ." 



Note 1. Falco velox. We have in another place quoted as 

 doubtful synonymes of this species, Falco dubius, and Falco obscu- 

 rus of authors, but have not restored to the species its old name, 

 finding it next to impossible to arrive at any certainty relative to 

 these meagre indications. Since this note was first written, how- 

 ever, we have had sufficient proofs to warrant us in asserting that 

 Falco obscurus is << a young female" of F. columbarius ; and that 

 Falco dubius is undoubtedly Wilson's supposed new species. Falco 

 fuscus of authors is another and still prior name for the same, and 

 we shall therefore adopt it. 



We have also a new species to be added to the same section. 

 These discoveries render it necessary to replace this part of the 

 Synopsis with the following. 



13 bis. Falco cooperii, Nob. Tail rounded, with four black- 

 ish bands, and tipped with white; wings reaching to the second 

 band ; second quill subequal to the sixth, third to the fifth. 

 Length eighteen inches or more. 



Adult unknown. Young dusky-brown, skirted with ferru- 

 ginous ; beneath white, with oblanceolate dusky-brown spots. 



Cooper's Hawk, Falco cooperii, Nob. Am. Orn. ii. pi. io. 

 jig. i. young. 



Inhabits North America : appearing in autumn and the 

 beginning of winter in the middle states. 



14. Falco fuscus, Gm- Tail even, with four blackish bands, 



